Cooling dynamo-electric machines.



ITED PATEN T OFFICE.

JOHN G. OALLAN, OF LYNN, MASSACHUSETTS, ASSIGN OR TO GENERAL ELECTRIC COMPANY,

cooling dynamo electric machines and parlarger scale than Fig.1

5 the frame work of a horizontal shaft dynamo 4 windows 4 formed in it is secured against setts have invented certain new and useful A CORPORATION on NEW YORK. COOLING nYNm/ro-ELEcTRrc Meomnns.

IiTo. 920,725. Specification ofLetters Patent. Patented May 4, 1909.

I Application filed April 23, 1906. Serial No. 313,149.

To allwhom itmay concern: v v ,1

Be it known that LJon-N Gr.v CALLAN, a citizen of the United States, residing at l partly in the shell and partly in the fan I l 1 Lynn, county of Essex, State of Massachu i wheeh The fan wheel 12' which may be made of cast steel or the like comprises a dished diskor. body portion 14. Axially extending blades 15- projectfrom'the outer side of the body portion 14- near its periphery. The ends of the blades 15 remote from the body ortion 14 are integrally connected together by an annular member or portion 16. An' annular deflector-"member 17 approximately g the current collecting are shaped in cross-section, is formed with a devices of such machines. recess in' its concave side-into which the en- T he various features of novelty which nular portion 16 is received. The deflector, characterize my invention are pointed out. 17 is secured to the annular member-16 by with particularity in the claims annexed to screws 18. I and forming a part of this specification. When thearmature shaftv 7 and fan wheel Forabetterimderstanding of my invention 12 rotate in' the direction indicated by the and the advantagespossessed by it, reference arrow'inFig, 3, the blades 15 cause air to may be had to the accompanying drawings move outward through the ace between and dcsfaiptive matter in which I have illusthe blades. This air strikes tie inner surtratcd one ofthe forms inwhich my invenface of the deflector member 17 and is retion may be embodied. versed in direction thereby and thrown down Figure 1 is an elevation partly broken upon. the surface of the commutator. The away and insect-ion of a portion of a dynamo speed of the air currents thus set in motion electric machine; Fig. 2 is an elevation on a and the direction given to them by the departly broken away fiector when the fan blades. and the deflector fan and guard eniare properly designed and proportioned, isploycd and Fig. 3 is a view taken at right such as to cause a rapid and powerful circuangles to Fig. 2' also partly'brokcn away and lation of air axially along a large proportion in section. of the total external surface of the commu- [teferring to the drawings, 1 represents tator. These air currents effectively cool p the commutator bars and also the brushes 19 cleclricmachine which in the form shown is which, are carried bya suitable supporting a high speed direct current generator adapted yoke 20. The alr currents also tend to pretobe directly connected toahorizontalshaft vent arcing between the brushes and the steam turbine.

Y I commutator bars. The'cooli'ng thus pro-' The field oles 2. are secured to the inner 'duced, is highly desirable, particularly with sideof the field rings by bolts 3; An end machines of the character described in which ,the speeds of the prime movers are so high that the commutators'are necessarily made relatively small in orderto limit their peripheral speeds. On account of this limitawhich is journaled one end of the armature tion it is of course, desirable to run the. cur-' shaft 7.. Between the. armature 8 proper rent density carriedby the individual com-. and bearing box 6 the shaft 7 supports the mutator bars as high as it is possible to do commutator, which in the forni shown has without injuriously affecting their efficiencies its conducting bars 9 secured inplace by and operation. shrink rings 10. The end 11 of the. com- Ihave found it advantageous to shape the mutator shell or support adjacent the bearblades in the manner shown in which the ing box 6 is threaded exteriorly. On this front face of each blade having reference to threaded end is' secured a fan wheel 12. the direction of rotation of the fan whe is After the fan wheel 12 is screwed home it reversel curved ,"the convex portion of the may be secured in place by a threaded pin surface sing at the outer edge'of the blade 13 screwed into a threaded recess formed and the'concave-portion at the-inner edge of Improvements in Cooling Dynamo-Electric of whichthe following is a specification.

My present invention has for its object the provision of a simple and effective means for ticularly for coolin and in section of the member "or bonnet 4 having openings or the commutator end of the field ring by bolts 5,. The bonnet 4 carries a bearing box 6 in so I chine.

the blade, and tlie rear surface of'the blade is alsoreglfrsely curved, but with itsconcave portion the outer edge of the blade and the convex portion at the inner edge. inner and outer edges of each blade,a1;e thus ra ically tangential to the circles touched y them and are wedge-shaped in cross-section. "I also find it advantageous to make the bodies of tli *blades materially thicker than the edges, thus reducing any tendency of the blades to vibrate. With the fan blades and deflector constructed and proportioned as shown, a highly eflicient and practically noiseless fan action is obtained.

While the particular construction -disclosedhasbeen found to give'excellent re.-' it will 'be readily under-.

suits in practice,

stood by those skilled in the art that changes :may be made in the form of my invention without-departing fromits spirit.

What I claim as new and desire to secure by Letters .Patent of theUnited States, is,'

1. Incombination, a rotating shaft, a

fmember of a dynamo-electric machine carried thereby, a fan member also carried by the shaft, said fan member com rising vanes or blades moving air outwar ly from the shaft, and a curved deflector membersubstantially arc-shaped in cross-section wherea by the air moved outwardly by'theblades is reversed in direction and discharged against said member. of the dynamo-electric ma- 2. In combinatiom a rotating shaft, a current collecting d'evice, blades or vanes moving air outwardly from the shaft, and a curved deflector member all carried by the shaft, 'said deflector member being substantially arc-shaped in cross-section whereby the .air moved outwardly by the blades is reversed in direction and discharged against.

. the current collecting device.

3. In combination, a rotating shaft, a current collecting devlce carried thereby,a fan member also carried by the shaft, said fanmember comprisinga disk like body portion, an annular deflector'member, and blades extending axiall'y between said body. member and said deflector member, said deflector" member being arranged ,so that the air moved outwardly by the fan blades engages it, and is deflected thereby againstsaid current collecting device? Y '4. Incombination, a rotating commutator comprising a'shell' member and bars, a fan wheel secured' to the-end lpf :the shell member andprovided with yanesjor blades which discharge air outwardly, and a deflector The secured to the fan wheel and arranged to, cause'the alrcurrents set motion by the blades to be deflected against the surface of the commutator. I

5. In combination, a rotating shaft, a current Jcollectingd'evice carried thereby, a fan also carried by the shaft, comprising a disk like body ortion, blades extending axially from said oily portion, an annular member w.

integrally connecting the ends of the blade remote from the body portion, and ai curved deflector -member formed with grooves in which said annular member is received,said deflector member being substantially arc shaped in cross-section whereby air moved member of a'dynamoelectricmachine carried thereby, a fan mefnber also carried by the shaft, said fan membercom rising vanes or'bIadesmOVing air outwar 1y from the shaft, and a curved deflector member sub stantially arc-shaped in .cross-section, ar-

ranged to deflect the air'moved outwardly by the fan blades and; dischargeit' against the rotating member of the dynamo-electric machine. 8. In combination, a. rotating shaft, a

'mem'berof a dynamo-electric machine carried thereby, a fan member also carried b 1 the shaft, said fan member comprising a disk like body ortion, an annular curved deflector mem er and blades extending'axially between said body portion and said deflector I -member, being substantially arc-shaped in cross-section; whereby the air moved outwardly by the blades is reversed in direction anddischarged against said member, of the dynamo-electric'machine.

In witness whereof, I have hereunto set .my hand this twentieth day of April, 1906.

' JOHN G-. C ALLAN.

' Witnesses:

JOHN A. MCMANUS, Jr., HENRY; WESTENDARP. 

